java: simple array question

try

params[params.length - 1]="extra"

No !
I need to ADD a new value, not to replace the last element !

and you have to set the size before setting value,

Object[] params = new Object[size] ;

you have resize array if you want to add!

check this example to resize, http://www.source-code.biz/snippets/java/3.htm

you better use some collectionlike ArrayList to avoid these hassles!

5 answers and no one fits my needs...

this is my function
public boolean appConnect( IConnection conn , Object[] params ){      
// I need to add an extra value to params
params[params.length] = "new value"; //gives me an error since the params needs to be resized
}

>>//gives me an error since the params needs to be resized

see my comment #34869865

>>5 answers and no one fits my needs...

how? did u try my suggestions?

>>this is my function

the resize would allow u to add a new value but you can't expect that reflected in the caller. for that you need to deal with ArrayList as I told earlier!

You have to use  a new array, see below

better to use ArrayLists

this is my function
public boolean appConnect( IConnection conn , Object[] params ){      
// I need to add an extra value to params
params[params.length] = "new value"; //gives me an error since the params needs to be resized
Object [] params1 = new Object[params.length+1];
for(int j =0; j<params.length; j++){
prams1[j]=params[j];

}
params1[params.length] = "extra";
}

of couse this operator which gives error should be removed:


public boolean appConnect( IConnection conn , Object[] params ){      
// I need to add an extra value to params
//params[params.length] = "new value"; //gives me an error since the params needs to be resized
Object [] params1 = new Object[params.length+1];
for(int j =0; j<params.length; j++){
prams1[j]=params[j];

}
params1[params.length] = "extra";
}

And you return this new array:
public Object[] appConnect( IConnection conn , Object[] params ){      
// I need to add an extra value to params
//params[params.length] = "new value"; //gives me an error since the params needs to be resized
Object [] params1 = new Object[params.length+1];
for(int j =0; j<params.length; j++){
prams1[j]=params[j];

}
params1[params.length] = "extra";

return params1;
}

following explains resizing an array which you'll need to do before adding the element
http://helpdesk.objects.com.au/java/how-do-i-resize-a-java-array